Physics
A soft iron piece is in the form of a closed ring (no free ends). A wire is wound over it to make it an electromagnet. What happens when current is passed in the wire ?
- It does not get magnetised.
- It gets temporarily magnetised.
- It becomes magnetised.
- It can be magnetised if broken into two parts.
Magnetism
21 Likes
Answer
It becomes magnetised
Reason — When the current flows through the soft iron piece in the form of a closed ring, it becomes magnetised. The north and south poles will be present on opposite sides of the ring.
Answered By
10 Likes
Related Questions
The magnetic field of an electromagnet can be increased by …………… in the solenoid and by ……………through the solenoid.
- increasing the number of turns, decreasing the current.
- decreasing the number of turns, increasing the current.
- decreasing the number of turns, decreasing the current.
- increasing the number of turns, increasing the current.
Which of the following statements are correct ?
(i) An electromagnet produces a permanent magnetic field.
(ii) An electromagnet can produce a strong magnetic field.
(iii) The polarity of electromagnet can be reversed by reversing the direction of current in the solenoid.
- all of the above
- (i) and (ii)
- (ii) and (iii)
- (i) and (iii)
Which of the following devices does not use an electromagnet ?
- Magnetic compass
- Electric fan
- Relay
- Microphone
The magnetic polarity at the two ends of a horse-shoe magnet depends on :
- the strength of current in the coil
- the number of turns in the coil
- the material on which the coil is wound
- the direction of current at the ends of the magnet.